Display screen or portion thereof with transitional graphical user interface



FIG. 1 is the first image in a sequence for a display screen or portion thereof with transitional graphical user interface showing our new design;

FIG. 2 is the second image thereof;

FIG. 3 is the third image thereof;

FIG. 4 is an enlarged view of a portion of FIG. 1;

FIG. 5 is an enlarged view of a portion of FIG. 2; and,

FIG. 6 is an enlarged view of a portion of FIG. 3.

FIGS. 4-6 are shown separately for clarity of illustration.

The outer perimeter illustrated by a pair of broken lines in FIGS. 1-3 depicts a display screen or portion thereof and forms no part of the claimed design. The remaining broken lines in FIGS. 1-3 illustrate portions of the transitional graphical user interface that form no part of the claimed design.

The appearance of the transitional image sequentially transitions between the images shown in FIGS. 1-3. The process or period in which one image transitions to another image forms no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with transitional graphical user interface, as shown and described. 